基于Linux系统的汽车噪音故障诊断系统

Fault diagnosis system of vehicle noise based on Linux system

对汽车发动机的空载噪声做采集得到wav格式的声音文件,通过对Linux系统的API调用,应用程序调用Linux内核中的声卡驱动完成。将得到的声音文件做FFT变换得到发动机4个端点的声强图,利用这些结果着重分析和识别了该发动机的主要噪声源,主要是通过汽车发动机各个不同部位产生的噪声对频率的贡献。根据发动机的频谱特性对其进行分析,可将其分为高,中,低3个频带。通过分析汽车噪声的声强可大致判断出汽车发动机部件的故障。整套系统已linux操作系统为基础,完成对噪声的采集,处理,分析。

through using the API of Linux OS,the apps use the driver of sound card of linux kernel.Capturing the car＇s engine noise,sound files（wav format is got）.The sound intensity maps can be got through the FFT from the sound files.Using these data to analysis and identification of the main noise source engine.Mainly through the different parts of the car engine noise generated by the contribution of the frequency.The frequency can be divided to 3 parts：high frequency,medium frequency and low frequency.Determine the fault automobile engine parts by the noise,and the system is based on linux operation system.